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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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(Optional) Setting a Path Cost for a Port

(Optional) Setting a Path Cost for a Port

Context

The path cost value range is determined by the calculation method. After the calculation method is determined, it is recommended that you set smaller path cost values for the ports with higher link rates.

In the Huawei calculation method, the link rate determines the recommended value for the path cost. Table 11-15 lists the recommended path costs for ports with different link rates.
Table 11-15  Mappings between link rates and path cost values

Link Rate

Recommended Path Cost

Recommended Path Cost Range

Allowable Path Cost Range

10 Mbit/s

2000

200 to 20000

1 to 200000

100 Mbit/s

200

20 to 2000

1 to 200000

1 Gbit/s

20

2 to 200

1 to 200000

10 Gbit/s

2

2 to 20

1 to 200000

Over 10 Gbit/s

1

1 to 2

1 to 200000

If a network has loops, it is recommended that you set a large path cost for ports with low link rates. STP/RSTP then blocks these ports.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. (Optional) Run:

    stp pathcost-standard { dot1d-1998 | dot1t | legacy }

    A path cost calculation method is specified.

    By default, the IEEE 802.1t standard (dot1t) is used to calculate the path costs.

    All Layer 2 switches enabled with STP or RSTP on the same network must use the same path cost calculation algorithm.

  3. Run:

    interface interface-type interface-number

    The view of an interface participating in STP calculation is displayed.

  4. Run:

    stp cost cost

    A path cost is set for the interface.

    • When the Huawei calculation method is used, cost ranges from 1 to 200000.
    • When the IEEE 802.1d standard method is used, cost ranges from 1 to 65535.
    • When the IEEE 802.1t standard method is used, cost ranges from 1 to 200000000.

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Updated: 2019-05-25

Document ID: EDOC1000097279

Views: 8106

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